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    ASTM D3934 - 14

    Standard Test Method for Flash/No Flash Test—Equilibrium Method by a Closed-Cup Apparatus

    Active Standard ASTM D3934 | Developed by Subcommittee: D01.21

    Book of Standards Volume: 06.01

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    Significance and Use

    5.1 This test method ensures that before the flash test is run the air/vapor space above the specimen has attained a saturation concentration of vapor by using standard closed cups under equilibrium conditions. The saturation concentration of the vapors will be attained at some temperature between that of the liquid and the cooler apparatus lid. However, this temperature will be close to the temperature of the specimen after it has been maintained at the specified temperature for at least a 10-min period. This test method does not provide for the determination of the actual flash point but only whether a specimen does or does not flash at a specified temperature.

    1. Scope

    1.1 This test method covers the determination of whether a liquid complies with the closed-cup flash point requirements in government regulations, or in specifications, or as agreed between the purchaser and the seller.

    1.2 This test method is limited to a temperature range between 0 and 110°C (32 and 230°F).

    1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.4 WarningMercury has been designated by many regulatory agencies as a hazardous material that can cause central nervous system, kidney and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for details and EPA’s website,, for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.

    1.5 This standard should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use.

    1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D56 Test Method for Flash Point by Tag Closed Cup Tester

    D93 Test Methods for Flash Point by Pensky-Martens Closed Cup Tester

    D3278 Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus

    D3828 Test Methods for Flash Point by Small Scale Closed Cup Tester

    D3941 Test Method for Flash Point by the Equilibrium Method With a Closed-Cup Apparatus

    E1 Specification for ASTM Liquid-in-Glass Thermometers

    E1137 Specification for Industrial Platinum Resistance Thermometers

    E2251 Specification for Liquid-in-Glass ASTM Thermometers with Low-Hazard Precision Liquids

    E2877 Guide for Digital Contact Thermometers

    ISO Standard

    ISO 1516 Paints, varnishes, petroleum, and related products--Flash/no-flash test--Closed cup equilibrium method Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036,

    ICS Code

    ICS Number Code 87.040 (Paints and varnishes)

    UNSPSC Code

    UNSPSC Code

    Referencing This Standard

    DOI: 10.1520/D3934-14

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D3934-14, Standard Test Method for Flash/No Flash Test—Equilibrium Method by a Closed-Cup Apparatus, ASTM International, West Conshohocken, PA, 2014,

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